diff --git a/collection/opendb-admin-menus/collection.json b/collection/opendb-admin-menus/collection.json
index 2b52a75..ddbbdb9 100644
--- a/collection/opendb-admin-menus/collection.json
+++ b/collection/opendb-admin-menus/collection.json
@@ -10,6 +10,7 @@
         "description": "存储文档 ID，系统自动生成"
       },
       "menu_id": {
+        "bsonType": "string",
         "description": "菜单项的ID，不可重复"
       },
       "name": {